California Water Distribution Operator Exam, Distribution System Design and Hydraulics: all 35 questions
All questions from the Distribution System Design and Hydraulics section for California Water Distribution Operator Exam, each with the correct answer.
- 2001What is backflow?
- 2002Back-siphonage occurs when which condition exists in the supply piping?
- 2003Back-pressure backflow occurs when:
- 2004Which backflow prevention method provides the highest level of protection?
- 2005Under the State Water Board's Cross-Connection Control Policy Handbook, what is the minimum vertical air-gap separation between the supply outlet and the flood level of the receiving vessel?
- 2006Which assembly is generally required to protect the public water supply from a high-hazard cross-connection that may see back-pressure?
- 2007A garden hose submerged in a bucket of fertilizer solution and connected to a hose bib is an example of what?
- 2008How often must testable backflow prevention assemblies be tested in California?
- 2009What is the water hammer?
- 2010Which operating practice helps reduce water hammer?
- 2011A pressure gauge reading is 0 psi at a customer's tap that normally has 60 psi. What should the operator check first?
- 2012In a gridded or looped distribution system, how is the water supplied to a given point?
- 2013What is the main disadvantage of a dead-end main?
- 2014Which type of pipe carries water from the source or treatment plant to the distribution system with few or no service connections?
- 2015How does a trunk main differ from a transmission main?
- 2016How are pressure and elevation related in a distribution system?
- 2017What is static pressure?
- 2018During a hydrant flow test, what does the residual pressure represent?
- 2019Which term describes the highest rate of water use during a single hour of the day?
- 2020What does per-capita demand measure?
- 2021Higher friction in a pipe causes which result?
- 2022What is cavitation in a pump?
- 2023Which sign usually indicates that a pump is cavitating?
- 2024Which type of storage facility sits on high ground and floats on the system to even out pressure and demand?
- 2025What are the main purposes of distribution system storage?
- 2026Which action should be done when a storage tank is drained for cleaning?
- 2027How is a map scale of 1 inch = 200 feet used?
- 2028What is the main purpose of a service line record such as a tap card?
- 2029Which material is commonly used for a corporation stop at the main tap?
- 2030What does a pressure reducing valve (PRV) do in a distribution system?
- 2031How is the surface area of a valve face calculated when thrust force is needed?
- 2032Which action increases the velocity of water in a pipe if the flow rate stays the same?
- 2033What relationship exists between water velocity and pressure in a pipe at a constant flow rate?
- 2034What is the pressure at the bottom of a tank filled with 46.2 feet of water?
- 2035A pressure gauge on a hydrant reads 80 psi. What is the matching head, in feet?